Preheat oven to 400 degrees. Slice each potato lengthwise into 1/4 inch ovals, then slice each oval lengthwise into matchsticks. Coat a baking sheet with 3 sprays of the vegetable oil. Combine the egg whites and Cajun spice in a bowl. Add the matchstick potatoes and mix to coat. Pour the coated potatoes onto the prepared baking sheet and spread them out into a single layer, leaving a little space between. Place the baking sheet on the bottom shelf of the oven. Bake for 40 to 45 minutes, until the fries are crispy, turning them every 6 to 8 minutes with a spatula so that they are brown evenly. Serve immediately.
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